(9.34)
where is the angle between the direction of interest and the antenna boresight, 3 dB is the 3 dB
beamwidth assumed to be 70, and Am is the maximum attenuation assumed to 20 dB.
The angular spread, , is referenced in the azimuth plane and this phenomenon is sometimes
referred to as the Power Azimuth Spectrum (PAS). This typically is represented as a Laplacian distribution
and is given below for sake of completion.
(9.35)
where D is the angle of departure and we have also included the NodeB antenna gain in the equation.
Angular spread values that are typically used for initial testing are on the order of 8 or so.
REFERENCES
[1] Digital Audio Broadcasting (DAB) Standard.
[2] European Telecommunications Standards Institute (ETSI), EN 300 744 v1.5.1: ???Digital Video Broadcasting
(DVB): Framing Structure, Channel Coding, and Modulation for Digital Terrestrial Television.???
[3] Wireless LAN Standard, 802.11.
[4] WiMax 802.16 Standard.
[5] 3GPP, Technical Specification 26.201, ???Long Term Evolution (LTE) Physical Layer ??“ General Description,???
Release 8.
[6] R. Wang, J. G. Proakis, E. Masry, and J. R. Zeidler, ???Performance Degradation of OFDM Systems Due to
Doppler Spreading,??? IEEE Transactions on Wireless Communications,Vol.
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